C# 使用带有MOQ的同步方法测试EF异步方法
我有这个方法:C# 使用带有MOQ的同步方法测试EF异步方法,c#,entity-framework,unit-testing,asynchronous,moq,C#,Entity Framework,Unit Testing,Asynchronous,Moq,我有这个方法: public async Task DeleteUserAsync(Guid userId) { using (var context = this.contextFactory.Create()) { var user = await context.Users.FirstOrDefaultAsync(x => x.Id.Equals(userId)); if (user =
public async Task DeleteUserAsync(Guid userId)
{
using (var context = this.contextFactory.Create())
{
var user = await context.Users.FirstOrDefaultAsync(x => x.Id.Equals(userId));
if (user == null)
{
throw new Exception("User doesn't exist");
}
context.Users.Remove(user);
await context.SaveChangesAsync();
}
}
我想测试一下。因此,我创建了一个测试:
[TestMethod]
public async Task DeleteUsersSuccessfulCallTest()
{
// Arrange
var id = Guid.NewGuid();
var user = new User() { Id = id };
var context = new Mock<IDashboardContext>();
var usersDbSet = DbSetQueryMocking.GenericSetupAsyncQueryableMockInterfaceSet(new List<User> { user }.AsQueryable());
context.Setup(x => x.Users).Returns(usersDbSet.Object);
context.Setup(x => x.Users.Remove(user)).Returns(user).Verifiable();
context.Setup(x => x.SaveChangesAsync()).ReturnsAsync(1).Verifiable();
this.contextFactory.Setup(x => x.Create()).Returns(context.Object);
// Act
await this.userService.DeleteUserAsync(id);
context.VerifyAll();
}
}
这一行:错误
没有它:一次成功的测试
如何解决此问题?由.AsQueryable()
生成的EnumerableQuery
类没有实现IDbAsyncQueryProvider
,但通过实现可以轻松扩展EnumerableQuery
。创建其中一个,而不是调用.AsQueryable()
来包装您的集合。我在下面有一个实现,它将它进一步扩展到IDbSet
,但您可能不需要走那么远
class StubSet<T> : EnumerableQuery<T>, IDbSet<T>, IDbAsyncQueryProvider
where T : class
{
public StubSet(IEnumerable<T> collection) : base(collection)
{
Local = new ObservableCollection<T>(collection);
}
public ObservableCollection<T> Local { get; private set; }
public T Find(params object[] keyValues)
{
throw new NotImplementedException();
}
public T Add(T entity)
{
Local.Add(entity);
return entity;
}
public T Remove(T entity)
{
Local.Remove(entity);
return entity;
}
public T Attach(T entity)
{
return Add(entity);
}
public T Create()
{
throw new NotImplementedException();
}
public TDerivedEntity Create<TDerivedEntity>() where TDerivedEntity : class, T
{
throw new NotImplementedException();
}
public void DeleteObject(T entity)
{
throw new NotImplementedException();
}
public void Detach(T entity)
{
throw new NotImplementedException();
}
async Task<object> IDbAsyncQueryProvider.ExecuteAsync(Expression expression, CancellationToken cancellationToken)
{
return ((IQueryProvider)this).Execute(expression);
}
async Task<TResult> IDbAsyncQueryProvider.ExecuteAsync<TResult>(Expression expression, CancellationToken cancellationToken)
{
return ((IQueryProvider)this).Execute<TResult>(expression);
}
}
类存根集:EnumerableQuery、IDbSet、IDBSyncQueryProvider
T:在哪里上课
{
公共存根集(IEnumerable集合):基(集合)
{
本地=新的可观测采集(采集);
}
公共可观测集合本地{get;私有集;}
public T Find(参数对象[]键值)
{
抛出新的NotImplementedException();
}
公共T添加(T实体)
{
本地。添加(实体);
返回实体;
}
公共T删除(T实体)
{
本地。移除(实体);
返回实体;
}
公共T附加(T实体)
{
返回添加(实体);
}
公共文件不能创建()
{
抛出新的NotImplementedException();
}
公共TDerivedEntity Create(),其中TDerivedEntity:class,T
{
抛出新的NotImplementedException();
}
公共void DeleteObject(T实体)
{
抛出新的NotImplementedException();
}
公共无效分离(T实体)
{
抛出新的NotImplementedException();
}
异步任务IDBSyncQueryProvider.ExecuteAsync(表达式表达式,CancellationToken CancellationToken)
{
返回((IQueryProvider)this.Execute(表达式);
}
异步任务IDBSyncQueryProvider.ExecuteAsync(表达式表达式,CancellationToken CancellationToken)
{
返回((IQueryProvider)this.Execute(表达式);
}
}
也许这篇文章来得有点晚,但无论如何:)
我建议您使用此库:
以下是GitHub项目:
请记住将所有的数据库集设置为虚拟
如果要使用FindAsync,则需要在“SetupData”方法中提供一个“Func”委托
例:
在这里,您可以看到此库如何模拟FindAsync:
希望这对别人有用 这很可能是mocking框架的问题,与EF或测试无关。我已经更新了这个问题,以反映这篇MSDN文章似乎是你的来源:发布它肯定会帮助其他人。
context.Setup(x => x.Users.Remove(user)).Returns(user).Verifiable();
class StubSet<T> : EnumerableQuery<T>, IDbSet<T>, IDbAsyncQueryProvider
where T : class
{
public StubSet(IEnumerable<T> collection) : base(collection)
{
Local = new ObservableCollection<T>(collection);
}
public ObservableCollection<T> Local { get; private set; }
public T Find(params object[] keyValues)
{
throw new NotImplementedException();
}
public T Add(T entity)
{
Local.Add(entity);
return entity;
}
public T Remove(T entity)
{
Local.Remove(entity);
return entity;
}
public T Attach(T entity)
{
return Add(entity);
}
public T Create()
{
throw new NotImplementedException();
}
public TDerivedEntity Create<TDerivedEntity>() where TDerivedEntity : class, T
{
throw new NotImplementedException();
}
public void DeleteObject(T entity)
{
throw new NotImplementedException();
}
public void Detach(T entity)
{
throw new NotImplementedException();
}
async Task<object> IDbAsyncQueryProvider.ExecuteAsync(Expression expression, CancellationToken cancellationToken)
{
return ((IQueryProvider)this).Execute(expression);
}
async Task<TResult> IDbAsyncQueryProvider.ExecuteAsync<TResult>(Expression expression, CancellationToken cancellationToken)
{
return ((IQueryProvider)this).Execute<TResult>(expression);
}
}
var mockDbSetDisplays = new Mock<DbSet<DbEntity>>().SetupData(dataSourceDisplays, this.FindDisplay);
private Display FindDisplay(object[] arg)
{
return this.dataSourceDisplays.FirstOrDefault(x=> x.DisplayId == arg[0] as int?);
}